Telegraphic receiving apparatus



Aug. 26, 1930. F. G. CREED 1,773,958

I TELEGRAPHIC RECEIVING APPARATUS Filed July 22 1927 3 Sheets-Sheet 1 H 16 /f o I fl g Aug. 26,1930. -F. G. CREED 1,773,958

. TELBGRAPHIC RECEIVING APPARATUS Filed July 22, 1927 3 Sheets-$heet 2 Aug. 26, 1930. F, CREQED 1,773,958

' TELEGRAPHIC RECEIVING APPARATUS Filed July -2p, 1927 3 Sh eets-Sheet s Patented Aug. 2 1930 "UNITED STATES, P TE 11 rnEnERIcxGEoBGE can, or" onovnon;nNcLlmn-AssIeNonro 01mm) Ann com 7 'rAnY IMITnnacoMrANY or enmrnnrcmm rELEGnAPIrIc imcmfvmc APPARATUS Application filed July 22 1927, Serial u 207,639, and in GrcatBr itain 'se emua 4 ,1926.

- This invention relates to start-stop telegraphic receiving and printing apparatus working on the five or other multiple unit system, according towhich successive groups of signals representing'letters orother char 'acters are, transmitted. to the receiving'and pri'nt'ingapparatus which reproduces them as ordinary printed-characters, each group of signals comprising a starting signal fol w lowed by a number of permutation signals, corresponding to the letter orcharacter, and by astopping signal. The apparatus com prises a driving shaft, that runs continuously when the apparatus is :in Operation, and from 5 which a printing 'wheelis indirectly driven through a clutch, and Withwhich. isasso- 1 ciated mechanism for selectively "positioning the printing wheel-so that itshall printordinary characters corresponding to those rep; resentedbysuccessive groups of permutation signals, such mechanism being set in operation, by the shaft on the receiptof a starting signal and being afterwardsselectively con trolled in accordance with the permutation signals to bringabout the desired reproduction of the signals inthe form of an ordinary printed character. The connection of the said mechanismtotheshaft on the receipt of a startingsignal and the subsequent control of such mechanism. in accordance w th totore been efi'ected jointly' by means herein-. after broadlycalled for brevity and dlStlTlc. tion, the controlling means, actuateddirect'ly .21; by an electro-magnetic relay worked by the.

line signals, or" by current derived from} a local battery andcontrolled 'by or frame-1i electro-magnetic relay inthe telegraph line,

'in'such a manner'that it or they will' accu- .1

. a strong current to operate its armature lever from which the controlling'means isactuatcd;

' very strong. K

the successive permutation signals havehere-.i

When such arelay'is operated direct by line signals, the signal The present ,inventionfhas for' its Y object to enable the controlling-means usedin tclegraphic receiving and printing apparatus of; c the start-stop kind, for rendering-all the sevi era] parts of the mechanism successively-op era-tive or not operative according to thepi'es once or absence of signals, or accord ng to the character ot' 'the signal impulses beingreceived, to be actuated ina 'better'way-than' heretofore usual, so as to' admit [of signals beingsent, received and dealt with more-efficiently than heretofore. A morespecific ob current must therefore be V ject isto reduce the current required for opcrating the electro-magnetic'relay by means of which the actuation of the controlling means is first initiated and-then caused-to proceed in accordance with the character. of the received impulses, whether such relay be, the line relay, orone controlled from the line relay.

i For this purpose, according tov the invehe tion, there is interposed between the eantrolling means used in start-stoptelegraphic receiving and printing apparatus and the electroemagneti'c line relay, or locally energized relay responsive to line signals, 'ajmev y chanic'al relay which derives power fromfthe driving motor or member'of the receiving apparatus and-is under the-control of the said electro-magnetic relay, the arrangement beingv such that the 'saidf'electroemagnetic relay has. only to exert suflicient power to release the output ofenergyfrom the me- 7 chanical' relay to actuate. the controllingmeans.

in various 'forms'but may conveniently be of-the type comprising escapement mechaing illustrative draw The mechanical relaycanbe constructed f graphic receiving apparatus of the kind hereinbefore referred to, embodying combined controlling means, a mechanical relay and an electro-magnetic relay according to the present invention. Fig. 4 shows partly in end elevation and partly in section on the line IVIV of Fig. 5, Fig. in horizontal section on the line VV of Fig. 4, and Fig. 6 in side elevation, the mechanical relay to a larger scale than in Figs. 1 and 2.

According to the construction of combined controlling means, mechanical relay and electro-magnetic relay. shown in the said drawings, the mechanical relay comprises an escapement device one member of which is constituted by a rotary plate 1 that is held by the pressure of a spring 2 in frictional contact with the adjacent end of a cylindrical body 3 arranged to be constantly rotated from the driving member 4 of the receiving aparatus, so that the rotary plate 1 will, when ree to do so, be rotated by the said body 3, the rotary plate and body constituting a rotary friction clutch device.

In the example shown, the driving member 4 of the apparatus is a vertical worm driven by an electric motor, not shown, and arranged vertically between and in gear with two worm wheels 5 and 6 fixed respectively to a cam shaft 7 and a printing wheel shaft 8. Attached to shaft 8 is a toothed wheel 9 that is in gear with a toothed wheel 10 fixed to a spindle 11 mounted in a bearing 12 and to one end of which the cylindrical body 3 is fixed. The other member of the escapei'nent device is constituted by two vertical arms 13 and 14 each pivoted at its lower end, one arm, namely 13, being provided at its upper end with a tooth or detent 13f adapted to engage the upper side of a longitudinal tooth or extension 1 carried by the rotary plate 1, at the end of one half revolution of such plate, and the upper end of the second arm 14 being provided with a stop lt adapted to form an abutment for the said tooth or extension 1", at the end of the next half revolution of the said plate. The two pivoted. arms 13 and 14 are connected together by a link 15 that is connected by another link 15" to the armature lever 16 of an electro-magnetic relay 17 which may be the line relay, or a relay controlled by and working in unison with such line relay, for moving the pivoted arms to right or left according as say a positive signal or a negative signal is being received. Fixed to the front side of the rotary plate 1 and journalled on a reduced portion 11 of the spindle 11 is an eccentric 18 on which is journalled one end 19 of a rod 19 the other end of which is connected in any suitable manner, as by a lever arm 20,

j to the controlling means of the receiving apparatus. The spring 2 bears at one end against the outer end of the eccentric 18 andat the other end against a head or collar 21 on the outer end of the portion 11 of the spindle. As will be understood, each time the escapement plate 1 is released it will be frictionally rotated through half a revolution by the rotating body 3 and its eccentric 18 caused to move the rod 19 and lever to the right or left, according to the nature of the telegraphic signal influencing the relay 17. The rotary plate 1 and cylindrical body 3 forming the friction clutch hereinbefore described, may be replaced by a ratchet, spring or other clutch.

The invention can be applied to combined telegraphic receiving and printing apparatus of various kinds, particularly to apparatus of the start and stop type. It may, for example, advantageously be applied to combined telegraphic receiving and printing apparatus of the start and stop type described in the specification of Patent 1,639,213, to F. G. Creed, and is so applied in the example shown in Figs. 1, 2 and3. Such apparatus comprises, briefly stated, a series of inde pendently adjustable members 23 adapted to be set in a variablemanner to correspond to varying positive and negative signals in a group of signals to be received, represent ing for example a character, or space, to be reproduced as an ordinary printed character, an adjuster 2lthat is adapted to be moved to-and-fro in front of the adjustable members and also towards and from such members, means for moving the adjuster to and fro comprising a rod 25 operated by a lever 26 from a cam 27 on a sleeve 28 adapted to be connected to and disconnected from the constantly rotating cam shaft 7 by a clutch device, as described in the said former specification, means comprising a spring blade 29 forming one arm of alever the other arm 29 of which is adapted to be operated by another cam 30 on the sleeve 28 whereby the adjuster 24L canbe moved towards each of the adjustable members 23 in turn when brought in front thereof, a spring blade 31 whereby the adjuster24 can afterwards be moved in a directionaway from the adjustable members 23, an electro-inagnetic relay responsive to the signals to be received, and means under the control of such electroemagnetic relay, whereby the clutch device can be operated at the required times and whereby the spring blade or arm 29 can be rendered operative or inoperative on the adjuster 24c and consequently on an adjustable member 23, according to the character of the signal being re ceived at the moment when the adjuster is opposite an adjustable member.

The means used in the telegraphic receiving apparatus described in the said specifica tion for rendering the adjuster 24 operative or inoperative on an adjustable member 23, according to the signal being received, and also the means used for actuating the detent or trip device used for controlling the clutch device between the driving shaft-7 and cam sleeve 28 in such combined receiving'and 'printingapparatus, and which consists of a,

rock shaft'32 with lever arms constituting in such apparatus what is herein called the controlling means, are, actuated from the armature of the said electro-magnetic relay." a In such apparatus asmodified according to the present invention, the electro-magnetic relay is replaced by a mechanical relay, such as that trip device controlling the clutch between the driving shaft 7 of the apparatus andthe sleeve 28 ca-rryingthe cams used for operatingvarious parts o'f'the'combined apparatus.

In other words the printing apparatusof the present a plication maybe said to differ from that 0 the earlier specification Serial No. 7 45,935 mainly inithat the rock shaft 32 is now moved not directly by the electro-mag netic relay but through the eccentric 18 associatedwith the clutch of the mechanical relay; When the tooth 1 of the arm 1 is engaged with either detent 13 or 14 due to receipt of a current impulse of one polarity it will remain in engagement with such detent during such time as another like impulse is received and until an impulse of opposite polarity arrives. The movement of the lever arm 29 towardthe'adjustable members 23 will therefore as before'either result or not in i the adjuster 24 being engaged.

As will be understood, by using a mechan ical relay aslhereinbefore described, each time the movable member of the friction clutch forming part of such relay, namely the rotary plate'l in the example described, is" released v such mechanical relay by the. action of the electro-magnetic relay 17, it movesthe controlling means, steadily .but

quickly from one extreme position to the other extreme position and can not oscillate or chatter like the armature lever of an electro-magn'etic' relay is liable to do, so that is essentially dead beat in action. a. I v

What I claim is I r l. Telegraphic receiving apparatus of the kind herein referred" to, comprising signal reproducing means embodying a driving member, clutch escapementmeans mounted thereon, controlling means for such reproducing means and responsive to said clutch escapement means, an electro-magnet relay vresponslve to recelved signals and a mechanlcal relay '-'actuated; ir'from the driving member aforesaid adapted to operateuthe controlling "Jmeans, such mechanical relay being con- .trolledby the electrol-magnetio relay; which has; only to exertsuificiehtpowr to release "the output :Jof energy- 5 from a the mechanical V-arelay, substantially 'asudescribedrr yIn "telegraphic Jreceiving' apparatus of .the kindherein referred to, a mechanical-relay an escapement device, 'a rotary driving member a d a member; tozbedr1ven,p1votal members forming a companion partiof the escapement device, clutch means mounted adjacent said rotary escapement member and .on sa d.

driving 'member whereby the said rotary member is intermittently moved and means comprising a rotary member forming. part of movable with the rotary member adapted to transmit motion to the member to be driven,

the said escapement having only to exertsufficient power'to release the'output of energy from the mechanical relay. V

3. In telegraphic receiving apparatus of g the kind herein referred to, a mechanical relay comprising a rotary clutchmember forming part of an escapement device, a driven member, a rotary driving member upon which such clutch and escapement member is loosely mounted, pivotal members forming a companion partof the escapement device, a sec-- 9 ond clutch member operatively secured to the driving member, an eccentric secured to said first named rotary member and a memberadapted to be driven by the eccentric, the al ternate release and arrest of the rotary member of the escapement device causing the cccentric thereof to move said driven member first in one direction, then to arrest-it and afterwards to move the same in the opposite direction and so on in accordance with the electric signals being received.

4. In telegraphic receiving apparatus of the kind herein referred to, amechanical relay comprising a rotary friction clutch mem- I I ber forming part of an escapement device,a: rotary driving member upon which such clutch and escapement member is loosely mounted, a driven member, pivotal members forming a companion part of the escapement device, a second'friction clutch member operatively secured to the driving member, spring means constantly urging the clutch members into frictional contact with one another, an eccentric secured to said first named relay member and a member adapted to be driven by the 'eccentricfthe alternate release and arrest of the rotary member of the escapement device causing the-eccentric thereof to move said driven member firstiin one direction, then ,7 to arrest it and afterwards to move the same inthe opposite direction and so on in accordance, with the electric signals being received. 5'. In a telegraphreceiving apparatus comprising signal reproducing means, a mechan-f ical relay having a rotatable clutch membena" driving member, complementary clutch es- "capement means loosely mounted on said driving member, an 'electro-magnetic relay responsive to received signals, complementary pivotally disposed escapement means assooiated with said clutch escapement and controlling oscillating means adapted to actuate said reproducing means during the en agement of said clutch members in accor ance with received electric signals.

Si ed'at Croydon, in the county of Surrey, Eng and, this seventh day of July, 1927.

FREDERICK GEORGE CREED. 

